I wonder if a real "blind test" is what is meant here. Certainly swapping any component in and out of your system will allow you to get an idea of what difference it makes. You will even be able to describe the difference, and note it for future reference. Nothing controversial about that. But a "blind" test involves hiding the identity of the component from the listener, who then chooses his or her preference. There are several things wrong with doing it this way, aside from the practical problem of finding someone you trust to swap components in your system while you are unable to observe him.
One theory has it that we are better equipped physically to notice similarities rather than differences. And as you say, the choice for the long term should be made on the basis of a longer term listen. Otherwise we may listen for the wrong things... at worst, for hi-fi and not for music.
One theory has it that we are better equipped physically to notice similarities rather than differences. And as you say, the choice for the long term should be made on the basis of a longer term listen. Otherwise we may listen for the wrong things... at worst, for hi-fi and not for music.